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The 2021 Trek Checkpoint ALR 4 is an aluminum frame gravel bike with mid-range components and hydraulic disc brakes.

2021 Trek Checkpoint ALR 4
MSRP$1,699
Online Price
$1

At

CategoryGravel
Weight22.6 lbs
FrameAluminum
ForkCarbon
Wheel Size700c
Wheel MaterialAluminum
Brake TypeHydraulic Disc
GroupsetGRX 400, GRX 600
Drivetrain2 × 10
Gear Range

Trek Checkpoint ALR 4

36 mph
SeatpostRigid
Brand Sitetrekbikes.com
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Spec Level

Based on build material and quality level of the frame, fork, wheelset, groupset, suspension system, and more. Learn more

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Checkpoint ALR 4

Geometry

Specs
Frame

300 Series Alpha Aluminum, tapered head tube, Control Freak internal routing, 3S chain keeper, rack and fender mounts, flat mount disc, horizontal sliding dropouts, 142x12mm thru axle

Fork

Checkpoint carbon, tapered alloy steerer, rack mounts, fender mounts, flat mount disc, 12x100mm thru axle

Bottom Bracket

Shimano RS500, 86mm, PressFit

Headset

FSA Integrated, sealed cartridge bearing, 1-1/8'' top, 1.5'' bottom

Stem

Size: 49, Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 80mm length; Size: 52, 54, Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 90mm length; Size: 56, 58, Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 100mm length; Size: 61, Bontrager Elite, 31.8mm, Blendr compatible, 7 degree, 110mm length

Handlebar

Size: 49, Bontrager Elite IsoZone VR-CF, alloy, 31.8mm, 93mm reach, 123mm drop, 38cm width; Size: 52, Bontrager Elite IsoZone VR-CF, alloy, 31.8mm, 93mm reach, 123mm drop, 40cm width; Size: 54, 56, Bontrager Elite IsoZone VR-CF, alloy, 31.8mm, 93mm reach, 123mm drop, 42cm width; Size: 58, 61, Bontrager Elite IsoZone VR-CF, alloy, 31.8mm, 93mm reach, 123mm drop, 44cm width

Saddle

Bontrager Montrose Comp, steel rails, 138mm width

Seatpost

Bontrager Comp, 6061 alloy, 27.2mm, 8mm offset, 330mm length

Groupset
Rear Derailleur

Shimano GRX RX400, long cage, 36T max cog

Front Derailleur

Shimano GRX RX400, braze-on

Crank

Size: 49, Shimano GRX RX600, 46/30, 165mm length; Size: 52, Shimano GRX RX600, 46/30, 170mm length; Size: 54, 56, Shimano GRX RX600, 46/30, 172.5mm length; Size: 58, 61, Shimano GRX RX600, 46/30, 175mm length

Shifters

Shimano GRX RX400, 10 speed

Cassette

Shimano Tiagra HG500, 11-34, 10 speed

Chain

KMC X10

Brakes

Shimano RX400 hydraulic disc, flat mount

Wheels
Rims

Bontrager Tubeless Ready, 28-hole, 17mm width, presta valve

Spokes

14g stainless steel

Front Hub

Bontrager alloy, sealed bearing, centerlock disc, 100x12mm thru axle

Rear Hub

Bontrager alloy, sealed bearing, centerlock disc, Shimano 11-speed freehub, 142x12mm thru axle

Tires

Bontrager GR1 Comp, wire bead, 60 tpi, 700x40c

Disk Rotors

Shimano SM-RT70, centerlock, 160mm